Abstract: The present invention relates to a method of extracting a call set-up failure probability and a premature disconnect probability, which are factors for accessing the quality control of a data network. In accordance with the present invention the method comprises the steps of configuring a database for causes of premature disconnect and a configuration database which stores quality values which includes originating and destination numbers. Reading the corresponding billing record and verifying whether the record is normal, and if so, determining whether the origination/destination number of the billing record is the same as that stored in the configuration database. Updating a statistics database for each configuration database, each origination/destination call, each time and date when the numbers match, and then calculating the call set-up failure probability and premature disconnect probability for each configuration database, call and each time and date of the statistics database.

Abstract: A digital interface apparatus operable to transmit and receive non-compressed digital data can allow a data interface between digital image apparatuses such as a digital VCR and a digital camcorder and a computer. A transmission timing controller in the digital interface apparatus for transmitting and receiving digital data via an IEEE 1394 serial bus, generates a clock select signal and timing signals. A transmission memory records data to be transmitted in synchronization with the clock designated by the clock select signal according to the timing signals generated by the transmission timing controller and outputs the recorded data in synchronization with a third clock. A controller generates the third clock, adds additional information to the data output from the transmission memory to then be transmitted via the IEEE 1394 serial bus, receives data transmitted via the IEEE 1394 serial bus, and restores a frame signal from the information added in the received data.

Abstract: A manipulator with six degrees of freedom includes a moving plate having three points arranged with substantial equal angles therebetween, a fixed plate having three protruding portions arranged with substantial equal angles therebetween, the fixed plate being positioned under the moving plate and being spaced apart from the moving plate, and three frames rotatably mounted on the protruding portions, respectively, each of the three frames having a first and a second points opposite from each other about the protruding portion.

Abstract: Operation of semiconductor devices suitable for high integration is achieved in a method for forming a metal wire, in which a plasma treating process is carried out to recruit a dense high-melting-point nitride film as a barrier layer.

Abstract: A tracking control method and apparatus of an image recorder/reproducer enable high performance tracking control by generating a capstan motor speed control value using a variable capstan speed command onto which a tracking error control is reflected. The method includes the steps of obtaining a tracking control value by performing a predetermined gain control on a tracking error; generating a variable capstan speed command onto which the tracking control value is reflected; determining the speed error of a capstan motor by comparing the capstan speed command and the actual rotating speed of a capstan motor; and obtaining a speed control value of a capstan motor onto which a tracking error is reflected, by performing a predetermined gain control on the speed error.

Abstract: A tracking control method and apparatus of an image recorder/reproducer enable high performance tracking control by generating a capstan motor speed control value using a variable capstan speed command onto which a tracking error control is reflected. The method includes the steps of obtaining a tracking control value by performing a predetermined gain control on a tracking error; generating a variable capstan speed command onto which the tracking control value is reflected; determining the speed error of a capstan motor by comparing the capstan speed command and the actual rotating speed of a capstan motor; and obtaining a speed control value of a capstan motor onto which a tracking error is reflected, by performing a predetermined gain control on the speed error.

Abstract: A tracking control apparatus includes a memory for storing tracking control information of a previous track corresponding to a present position of a current track being tracking-controlled, and a tracking controller for generating a new tracking control signal by using a tracking error signal derived from the current track and stored tracking control information for the previous track, to thereby enhance the precision of tracking control of the present track even when the track is deformed. A corresponding method is also described.